EXHIBIT 21.0 MUELLER INDUSTRIES, INC. List of Subsidiaries State or Country Subsidiary* of Incorporation - ------------------ ---------------- Mueller Brass Co. (Assumed name: Mueller Brass Products) Michigan Mueller Industrial Realty Co. Michigan Itawamba Industrial Gas Company, Inc. Mississippi Streamline Copper & Brass Ltd. Canada Mueller Plastics Holding Company, Inc. Ohio Mueller Plastics Corporation, Inc. Delaware MPC Foundry, Inc. Delaware MPC Machine Shop, Inc. Delaware Mueller Brass Forging Company, Inc. Delaware Mueller Copper Fittings Company, Inc. Delaware Mueller Fittings Company, Inc. Michigan Mueller Copper Tube Company, Inc. Delaware Mueller East, Inc. Delaware Mueller Formed Tube Company, Inc. Delaware Mueller Impacts Company, Inc. Delaware Mueller Line Set Inc. Delaware Mueller Press Company, Inc. Mississippi Mueller Refrigeration Products Company, Inc. Delaware Mueller Refrigeration Company, Inc. Michigan Mueller LBHC, Inc. Delaware Lincoln Brass Works, Inc. (Assumed name: Mueller Gas Products) Michigan Overstreet-Hughes, Co., Inc. Tennessee Mueller Refrigeration Holding Co., Inc. Delaware Mueller Streamline Co. Delaware Precision Tube Company, Inc. Pennsylvania Southland Pipe Niples Co., Inc. Texas Mueller Tool and Machine, Inc. Delaware Mueller Casting Company, Inc. Delaware Micro Gauge, Inc. Michigan Microgauge Machining, Inc. Michigan Propipe Technologies, Inc. (Assumed name: Mueller Gas Products) Ohio WTC Holding Company, Inc. Michigan Mueller Europe, Ltd. United Kingdom Vemco Brasscapri Ltd. United Kingdom Brasscapri Limited United Kingdom Primaflow Limited United Kingdom KX Company Limited United Kingdom Brassware Sales Limited United Kingdom Instox Limited United Kingdom DENO Investment Company, Inc. Michigan Mueller de Mexico S.A. de C.V. (1) Mexico DENO Holding Company, Inc. Michigan DENO Acquisition EURL France Mueller Europe, S.A. (2) France B & K Industries, Inc. Illinois Mueller Copper Tube Products, Inc. Delaware -1- List of Subsidiaries State or Country Subsidiary* of Incorporation - ------------------ ---------------- Arava Natural Resources Company, Inc. Delaware United States Fuel Company Nevada King Coal Company Utah Canco Oil & Gas Ltd. Alberta, Canada Aegis Oil & Gas Leasing Ltd. Alberta, Canada Bayard Mining Corporation Delaware Washington Mining Company Maine Amwest Exploration Company Delaware USSRAM Exploration Company Maine Richmond-Eureka Mining Company (81%) Maine Ruby Hill Mining Company (75%) Nevada White Knob Mining Company Idaho Arava Exploration Company Colorado Summit Systems, Inc. Delaware Kennet Company Limited Bermuda Mining Remedial Recovery Company Delaware Carpentertown Coal & Coke Company Pennsylvania USS Lead Refinery, Inc. Maine Leon Water Enterprises, Inc. (50%) Texas Macomber Construction Company Ohio Macomber Incorporated Ohio Macomber Building and Land Corporation Delaware DENO Investment Company II, Inc. Michigan MII Financial Corporation Michigan Mueller Streamline Holding S.L. Spain WTC HoldCo I, LLC Delaware WTC HoldCo II, LLC Delaware Mueller Comercial de Mexico S. de R.L. de C.V. (3) Mexico NICNA Mexico S. de R.L. de C.V. (4) Mexico NICNA Mexico Servious S. de R.L. de C.V. (4) Mexico NICNA Mexico Proyectos S. de R.L. de C.V. (4) Mexico NICNA Mexico Comercial S. de R.L. de C.V. (4) Mexico NICNA Mexico Ventas S. de R.L. de C.V. (4) Mexico NICNA Mexico Maquinaria S. de R.L. de C.V. (4) Mexico Mueller Streamline II, LLC Delaware Mueller Streamline Trading, LLC Delaware Mueller Streamline China, LLC Delaware Jiangsu Mueller-Xingrong Copper Industries Limited (50.5%) China * All subsidiaries are 100% owned, except as shown. (1) Owned by DENO Investment Company, Inc. (99.8%) and Mueller Streamline Co. (.2%). (2) On March 3, 2003, Mueller Europe S.A. filed a petition for liquidation with the Commercial Court of Provins Province, France and, on March 4, the Court declared the entity to be in liquidation. Less than 1% owned by non-affiliated individuals. (3) Owned by Mueller Streamline Holding S.L. (51.7%) and WTC HoldCo I, LLC ( 48.3% ). (4) Less than 1% of the outstanding common stock is owned by WTC HoldCo I, LLC. -2-